no,if the developer has provided it,it must have been fool proofed and double-checked but i wouldn't trust any third party software,if the nightclock screen flickers even a bit,it may prevent screen burn,like there are charms or something.
you must have installed a third party free software,like mobogenie e.t.c,so go to your settings and find permissions in there you might find a permission regarding your lock screen dont allow any non-samsung apps access to it,and that should do it,lemme know if that did the trick.ciao:cool: